I believe that @DobieLover was thinking of this:Welded galvanized wire, heaviest guage you can find. Im not sure we're thinking of the same thing. Poultry wire will keep birds in, but it wont keep predators out, is it possible you are confusing the two very different materials.
Is that what you were thinking of?
You've been given some great advice, hardware cloth will definitely fix the issue. Good luck with your flock and welcome aboard!